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| The heart of the system is a ten-pass amplifier based on Yb:CaF2, which is pumped by two diode laser stacks emitting at 940 nm. The amplifier itself is seeded by either a two-stage chirped pulse Yb:glass MOPA (which the team refers to as the pre-amplifiers of POLARIS or the POLARIS front end) or a Q-switched nanosecond Yb:YAG MOPA. (Image credit: Mathias Siebold) |
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